What is this horrible noise in our new Class C?

Could it be the vents? If partially open without dome style covers, it could rattle.

Stove vent flap on the outside of the RV not latched down?

Great thoughts! Thank you. I don't think it's the vents. We hear the noise when they are closed and we do have brand new vent covers installed. I will have to check the stove vent flap. Where is it located? Would it result in a sound that is coming from just above the windshield where the cab meets the bottom of the top bunk (i.e.: just over the visors)? I'm told Miine Winnie are typically pretty solid so I hope it's something simple. Thanks again for your help.

Antenna Coax flopping around on the roof??

Moved from Forum Technical Support

Make sure TV antenna is lowered all the way in the correct position.

Is the noise steady with a regular rhythm, or does it vary with a random pattern? A friend with a similar setup found by having a person or some other load up in the bunk, the noise diminished. The problem was some sort of adhesion between the cab roof and the cab-over bunk. I don't know how it got fixed other than a local RV repair guy waved his magic wand and all was good. I personally had a noise thing like this on a pop-up truck camper and the same repair guy went over it and found self-tapping screws that were not biting in real well.

Did a window come unlatched? Had that happen to me 20 minutes after picking mine up. Driving down the highway I was a little ticked with the noise. Pulled over and found the window slightly open, slide it closed and it was fine.

Big Time II wrote:
we do have brand new vent covers installed.

I had the same noise about two weeks after new vent covers were installed.

Turned out that one of the hold down clip pins on the vent cover wasn't installed properly, and only went through one of the holes in the cover. This allowed the vent cover to lift up about an inch when going more than twenty miles an hour.

The unlatched pin was scraping on the roof as the vent cover flapped.

I got a ladder, climbed up and pushed the pin through both holes and secured it properly. Now, no more noise.

You can see the clip pins in the video at https://youtu.be/w_w7mka-dHo?t=2m55s

Bill

Bill

Thanks for all the great feedback. We think we finally located the problem. We checked all the hatches, vents, antenna and awning. We found that the front awning arm is not seating snugly when the awning is rolled up and locked into position for traveling. It's a Dometic awning. The rear arm sits snugly. When there is a strong crosswind, it causes the arm to rattle. I would've sworn the noise was emanating from above the windshield and I'm not sure why we seem to hear it more there than through the side door closest to where the arm is actually located, for example. Nonetheless, we are convinced (or perhaps extremely hopeful) that if we get it fixed we will be rattle free again.

Thanks again for all the helpful suggestions. The responses here caused us to stop focusing on the structure and look at the exterior component parts.